Roasting-furnace.



No. 697,062. Patented Apr. a, |902. L. T. WRIGHT. AmJAsTlm; FunNAca.

(Application filed July 24, XQOLI (No Model.)

L ATTORNEY.

1n: Nonms PETERS co., Puoaumo., wAsmNuToN, D. c.

UNiTnp STATES PATENT Grrlcn.

LEVIS T. VRIGHT, KESWICK, CALIFORNIA.

ROASTlNG-FURNACEl SPECIFICATION forming part of Letters Patent N 0.697,062, dated April 8, 1902.

Application filed July 24,1901.

To all whom it may concern:

Be it known that I, LEWIS T. WRIGHT, a

subject of the King of Great Britain, residing at Keswick, in the countyof Shasta and State of California, have invented certain new and usefulImprovements in Roasting-Furnaces, of which the following is aspecification.

My invention relates to improvements in that class of roasting-furnacesdescribed in my United States Patent No. 629,023, dated July 18, 1899.In said patent I show and describe an outer hollow shaft carrying thestirring-arms, an open-bottomed pipe in said shaft, and an intermediatepipe in said shaft, which intermediate pipe was therein shown anddescribed as having a closed bottom. I

have discovered that if the intermediate pipe be made open at the bottomthe water will still continue to circulate substantially in the samedirection as before when said pipe was closed at the bottomthat is tosay, when said intermediate pipe is open at the bottom the waterdischarging from the innermost pipe will not now pass through said openbottom of the intermediate pipe, and thus up through the hollow shaft,without traversing the arms, but will continue to travel up theintermediate pipe to the inner arms, thence outward and back through theouter arms, and then up through the hollow shaft. I do not say thatabsolutely the whole of the water thus passes radiallyalong the arms andback again; but at least sufficient water so passes to pro-v duce thenecessary cooling effect. This construction is found to be particularlyadvantageous when the water used for cooling the apparatus contains alarge proportion of solid matter in suspension.

In the accompanying drawings, Figure l is a broken central verticalsection of the apparatus, showing the hollow shaft and the stirring-armsin side elevation; and Fig. 2 is a vertical section of the lower portionof the hollow shaft, the innermost pipe, and the iutermediate pipe.

Referring to the drawings, l represents the furnace proper, having thehollow outer shaft 2, the innermost pipe 3, and the intermediate pipe 4.Said hollow outer shaft carries the hollow stirring-arms 5, upon whichare secured the rabbles 6. "Within said stirringarms 5 are branch pipes'7, open at the end Serial No. 69,588. (No model.)

and discharging into the hollow stirring-arms,

said pipes 7 being supported iu said stirringarms by spiders 8. 9 is afeed-water pipe leading to the innermost pipe, and 10 is an exhaust-pipeleading from the hollow shaft.

The whole of the above construction is precisely the same as that shownin the patent above referred to, and therefore need not be moreparticularly described, the only exception being that the intermediatepipe is now open at the bottom, as shown at 1l, instead of closed, asformerly. I find that notwithstandingthe lower end of the intermediatepipe being open the water will tend to travel in the same direction asformerly, this being due to the suction up said intermediate pipe by theheating of the water within the stirring arms. This construction isadvantageous, in that it permits said pipes to be Very easily cleaned,which is of particular importance when the water used contains a largequantity of sand or other solid matter in suspension.

I claim;-

l. In a roasting-furnace, the combination, with a series of iioors, of acentral' hollow shaft, hollow arms carried thereon over the respectiveiioors, an open-bottomed pipe inserted in said shaft, a secondopen-bottomed pipe in said-shaft into which the first pipe dischargesintermediate to said first pipe and shaft, open-ended pipes leading fromthe intermediate pipe into the hollow arms, and

feedv and exhaust pipes connected to the firstpipe and hollowshaft,substantially as denesses.

LEWIS T. WRIGHT. Witnesses:

F. O. HURT, A. DONALD.

